Jupyter computes section slower during run all than seperate execution

Hi, I’m running in a isse concerning the execution time for a group of sections.
I’ve 5 sections for whom I messure the execution time. When I run these sections with ‘run all below’ the execution time is around 250ms. The runtime during ‘run all’ is alway around two times slower.
Can anyone tell me why this is the case?

Thanks a lot.